Nearly 150 employees, politicians and contractors in the nation's second-largest county have been convicted on corruption charges since 1957, according to a report released Thursday by the university and the Better Government Association (.pdf)

1999-2009: The Decade of Indictments

The 33-page study gives a history of corruption, starting from 1869 when county commissioners were jailed for rigging a bid to paint City Hall. It also details hiring scandals, including some under Cook County Board President Todd Stroger. Stroger hasn't been charged with any crime.